const path = require('path')
const { isPlainObject } = require('lodash')
const supertest = require('supertest')
const app = require('../../server')
const enterpriseServerReleases = require('../../lib/enterprise-server-releases')
const nonEnterpriseDefaultVersion = require('../../lib/non-enterprise-default-version')
const Page = require('../../lib/page')
const { get } = require('../helpers')

describe('redirects', () => {
  jest.setTimeout(5 * 60 * 1000)

  let redirects
  beforeAll(async (done) => {
    const res = await get('/en?json=redirects')
    redirects = JSON.parse(res.text)
    done()
  })

  test('page.redirects is an array', () => {
    const page = new Page({
      relativePath: 'github/collaborating-with-issues-and-pull-requests/about-branches.md',
      basePath: path.join(__dirname, '../../content'),
      languageCode: 'en'
    })
    expect(isPlainObject(page.redirects)).toBe(true)
  })

  test('dotcom homepage page.redirects', () => {
    const page = new Page({
      relativePath: 'github/index.md',
      basePath: path.join(__dirname, '../../content'),
      languageCode: 'en'
    })
    expect(page.redirects['/articles']).toBe(`/en/${nonEnterpriseDefaultVersion}/github`)
    expect(page.redirects['/en/articles']).toBe(`/en/${nonEnterpriseDefaultVersion}/github`)
    expect(page.redirects['/common-issues-and-questions']).toBe(`/en/${nonEnterpriseDefaultVersion}/github`)
    expect(page.redirects['/en/common-issues-and-questions']).toBe(`/en/${nonEnterpriseDefaultVersion}/github`)
    expect(page.redirects[`/en/enterprise/${enterpriseServerReleases.latest}/user/articles`]).toBe(`/en/enterprise-server@${enterpriseServerReleases.latest}/github`)
    expect(page.redirects[`/en/enterprise/${enterpriseServerReleases.latest}/user/common-issues-and-questions`]).toBe(`/en/enterprise-server@${enterpriseServerReleases.latest}/github`)
  })

  test('converts single `redirect_from` strings values into arrays', async () => {
    const page = new Page({
      relativePath: 'github/collaborating-with-issues-and-pull-requests/about-conversations-on-github.md',
      basePath: path.join(__dirname, '../../content'),
      languageCode: 'en'
    })
    const expected = `/en/${nonEnterpriseDefaultVersion}/github/collaborating-with-issues-and-pull-requests/about-conversations-on-github`
    expect(page.redirects['/en/articles/about-discussions-in-issues-and-pull-requests']).toBe(expected)
  })

  describe('query params', () => {
    test('are preserved in redirected URLs', async () => {
      const res = await get('/enterprise/admin?query=pulls')
      expect(res.statusCode).toBe(301)
      const expected = `/en/enterprise-server@${enterpriseServerReleases.latest}/admin?query=pulls`
      expect(res.headers.location).toBe(expected)
    })

    test('have q= converted to query=', async () => {
      const res = await get('/en/enterprise/admin?q=pulls')
      expect(res.statusCode).toBe(301)
      const expected = `/en/enterprise-server@${enterpriseServerReleases.latest}/admin?query=pulls`
      expect(res.headers.location).toBe(expected)
    })

    test('work with redirected search paths', async () => {
      const res = await get('/en/enterprise/admin/search?utf8=%E2%9C%93&query=pulls')
      expect(res.statusCode).toBe(301)
      const expected = `/en/enterprise-server@${enterpriseServerReleases.latest}/admin?utf8=%E2%9C%93&query=pulls`
      expect(res.headers.location).toBe(expected)
    })

    test('do not work on other paths that include "search"', async () => {
      const reqPath = `/en/enterprise-server@${enterpriseServerReleases.latest}/admin/configuration/enabling-unified-search-between-github-enterprise-server-and-githubcom`
      const res = await get(reqPath)
      expect(res.statusCode).toBe(200)
    })

    test('work on deprecated versions', async () => {
      const res = await get('/enterprise/2.12/admin/search?utf8=%E2%9C%93&q=pulls')
      expect(res.statusCode).toBe(200)
    })
  })

  describe('trailing slashes', () => {
    test('are absent from all redirected URLs', async () => {
      const keys = Object.keys(redirects)
      expect(keys.length).toBeGreaterThan(100)
      expect(keys.every(key => !key.endsWith('/') || key === '/')).toBe(true)
    })

    test('are absent from all destination URLs', async () => {
      const values = Object.values(redirects)
      expect(values.length).toBeGreaterThan(100)
      expect(values.every(value => !value.endsWith('/'))).toBe(true)
    })

    test('are redirected for HEAD requests (not just GET requests)', async () => {
      const res = await supertest(app).head('/articles/closing-issues-via-commit-messages/')
      expect(res.statusCode).toBe(301)
      expect(res.headers.location).toBe('/articles/closing-issues-via-commit-messages')
    })
  })

  describe('external redirects', () => {
    test('work for top-level request paths', async () => {
      const res = await get('/git-ready')
      expect(res.statusCode).toBe(301)
      expect(res.headers.location).toBe('http://gitready.com/')
    })

    test('work for article-level request paths', async () => {
      const res = await get('/articles/testing-webhooks')
      expect(res.statusCode).toBe(301)
      expect(res.headers.location).toBe('http://developer.github.com/webhooks/testing/')
    })
  })

  describe('localized redirects', () => {
    test('redirect_from for renamed pages', async () => {
      const { res } = await get('/ja/desktop/contributing-to-projects/changing-a-remote-s-url-from-github-desktop')
      expect(res.statusCode).toBe(301)
      const expected = `/ja/${nonEnterpriseDefaultVersion}/desktop/contributing-and-collaborating-using-github-desktop/changing-a-remotes-url-from-github-desktop`
      expect(res.headers.location).toBe(expected)
    })
  })

  describe('enterprise home page', () => {
    const enterpriseHome = `/en/enterprise-server@${enterpriseServerReleases.latest}`
    const japaneseEnterpriseHome = enterpriseHome.replace('/en/', '/ja/')

    test('/enterprise', async () => {
      const res = await get('/enterprise')
      expect(res.statusCode).toBe(301)
      expect(res.headers.location).toBe(enterpriseHome)
    })

    test('no language code redirects to english', async () => {
      const res = await get(`/enterprise/${enterpriseServerReleases.latest}`)
      expect(res.statusCode).toBe(301)
      expect(res.headers.location).toBe(enterpriseHome)
    })

    test('no version redirects to latest version', async () => {
      const res = await get('/en/enterprise')
      expect(res.statusCode).toBe(301)
      expect(res.headers.location).toBe(enterpriseHome)
    })

    test('no version redirects to latest version (japanese)', async () => {
      const res = await get('/ja/enterprise')
      expect(res.statusCode).toBe(301)
      expect(res.headers.location).toBe(japaneseEnterpriseHome)
    })
  })

  describe('2.13+ deprecated enterprise', () => {
    test('no language code redirects to english', async () => {
      const res = await get('/enterprise/2.13')
      expect(res.statusCode).toBe(301)
      expect(res.headers.location).toBe('/en/enterprise/2.13')
    })

    test('admin/guides redirects to admin', async () => {
      const res = await get('/en/enterprise/2.13/admin/guides')
      expect(res.statusCode).toBe(301)
      expect(res.headers.location).toBe('/en/enterprise/2.13/admin')
    })
  })

  describe('<2.12 deprecated enterprise', () => {
    test('english language code redirects to no language code', async () => {
      const res = await get('/en/enterprise/2.12')
      expect(res.statusCode).toBe(301)
      expect(res.headers.location).toBe('/enterprise/2.12')
    })

    test('frontmatter redirect', async () => {
      const res = await get('/enterprise/2.12/user/articles/github-flavored-markdown')
      expect(res.statusCode).toBe(301)
      expect(res.text).toContain('location=\'/enterprise/2.12/user/categories/writing-on-github/\'')
    })
  })

  describe('enterprise admin', () => {
    const enterpriseAdmin = `/en/enterprise-server@${enterpriseServerReleases.latest}/admin`
    const japaneseEnterpriseAdmin = enterpriseAdmin.replace('/en/', '/ja/')

    test('no language code redirects to english', async () => {
      const res = await get(`/enterprise/${enterpriseServerReleases.latest}/admin`)
      expect(res.statusCode).toBe(301)
      expect(res.headers.location).toBe(enterpriseAdmin)
    })

    test('no version redirects to latest version', async () => {
      const res = await get('/en/enterprise/admin')
      expect(res.statusCode).toBe(301)
      expect(res.headers.location).toBe(enterpriseAdmin)
    })

    test('admin/guides redirects to admin', async () => {
      const res = await get(`/en/enterprise/${enterpriseServerReleases.latest}/admin/guides`)
      expect(res.statusCode).toBe(301)
      expect(res.headers.location).toBe(enterpriseAdmin)
    })

    test('no version plus admin/guides redirects to admin on latest version', async () => {
      const res = await get('/en/enterprise/admin/guides')
      expect(res.statusCode).toBe(301)
      expect(res.headers.location).toBe(enterpriseAdmin)
    })

    test('admin/guides redirects to admin in redirects', async () => {
      const res = await get(`/en/enterprise/${enterpriseServerReleases.latest}/admin/guides/installation/upgrading-github-enterprise`)
      expect(res.statusCode).toBe(301)
      const redirectRes = await get(res.headers.location)
      expect(redirectRes.statusCode).toBe(200)
      const expected = `/en/enterprise-server@${enterpriseServerReleases.latest}/admin/enterprise-management/upgrading-github-enterprise-server`
      expect(res.headers.location).toBe(expected)
    })

    test('no version redirects to latest version (japanese)', async () => {
      const res = await get('/ja/enterprise/admin')
      expect(res.statusCode).toBe(301)
      expect(res.headers.location).toBe(japaneseEnterpriseAdmin)
    })

    test('admin/guides redirects to admin (japanese)', async () => {
      const res = await get(`/ja/enterprise/${enterpriseServerReleases.latest}/admin/guides`)
      expect(res.statusCode).toBe(301)
      expect(res.headers.location).toBe(japaneseEnterpriseAdmin)
    })
  })

  describe('enterprise user homepage', () => {
    const enterpriseUser = `/en/enterprise-server@${enterpriseServerReleases.latest}/github`
    const japaneseEnterpriseUser = enterpriseUser.replace('/en/', '/ja/')

    test('no product redirects to GitHub.com product', async () => {
      const res = await get(`/en/enterprise/${enterpriseServerReleases.latest}/user`)
      expect(res.statusCode).toBe(301)
      expect(res.headers.location).toBe(enterpriseUser)
    })

    test('no language code redirects to english', async () => {
      const res = await get(`/enterprise/${enterpriseServerReleases.latest}/user/github`)
      expect(res.statusCode).toBe(301)
      expect(res.headers.location).toBe(enterpriseUser)
    })

    test('no version redirects to latest version', async () => {
      const res = await get('/en/enterprise/user/github')
      expect(res.statusCode).toBe(301)
      expect(res.headers.location).toBe(enterpriseUser)
    })

    test('no version redirects to latest version (japanese)', async () => {
      const res = await get('/ja/enterprise/user/github')
      expect(res.statusCode).toBe(301)
      expect(res.headers.location).toBe(japaneseEnterpriseUser)
    })
  })

  describe('enterprise user article', () => {
    const userArticle = `/en/enterprise-server@${enterpriseServerReleases.latest}/github/getting-started-with-github/set-up-git`
    const japaneseUserArticle = userArticle.replace('/en/', '/ja/')

    test('no product redirects to GitHub.com product on the latest version', async () => {
      const res = await get(`/en/enterprise/${enterpriseServerReleases.latest}/user/articles/set-up-git`)
      expect(res.statusCode).toBe(301)
      expect(res.headers.location).toBe(userArticle)
    })

    // 2.16 was the first version where we moved /articles/foo to /github/<category>/foo
    test('no product does not redirect to GitHub.com product in <=2.15', async () => {
      const res = await get('/en/enterprise/2.15/user/articles/set-up-git')
      expect(res.statusCode).toBe(200)
    })

    test('no language code redirects to english', async () => {
      const res = await get(`/enterprise/${enterpriseServerReleases.latest}/user/github/getting-started-with-github/set-up-git`)
      expect(res.statusCode).toBe(301)
      expect(res.headers.location).toBe(userArticle)
    })

    test('no version redirects to latest version', async () => {
      const res = await get('/en/enterprise/user/github/getting-started-with-github/set-up-git')
      expect(res.statusCode).toBe(301)
      expect(res.headers.location).toBe(userArticle)
    })

    test('no version redirects to latest version (japanese)', async () => {
      const res = await get('/ja/enterprise/user/github/getting-started-with-github/set-up-git')
      expect(res.statusCode).toBe(301)
      expect(res.headers.location).toBe(japaneseUserArticle)
    })
  })

  describe('enterprise user article with frontmatter redirect', () => {
    const userArticle = `/en/enterprise-server@${enterpriseServerReleases.latest}/github/getting-started-with-github/access-permissions-on-github`
    const redirectFromPath = '/articles/what-are-the-different-access-permissions'
    const japaneseUserArticle = userArticle.replace('/en/', '/ja/')

    test('redirects to expected article', async () => {
      const res = await get(`/en/enterprise/${enterpriseServerReleases.latest}/user${redirectFromPath}`)
      expect(res.statusCode).toBe(301)
      expect(res.headers.location).toBe(userArticle)
    })

    test('no language code redirects to english', async () => {
      const res = await get(`/enterprise/${enterpriseServerReleases.latest}/user${redirectFromPath}`)
      expect(res.statusCode).toBe(301)
      expect(res.headers.location).toBe(userArticle)
    })

    test('no version redirects to latest version', async () => {
      const res = await get(`/en/enterprise/user${redirectFromPath}`)
      expect(res.statusCode).toBe(301)
      expect(res.headers.location).toBe(userArticle)
    })

    test('no version redirects to latest version (japanese)', async () => {
      const res = await get(`/ja/enterprise/user${redirectFromPath}`)
      expect(res.statusCode).toBe(301)
      expect(res.headers.location).toBe(japaneseUserArticle)
    })
  })

  describe('desktop guide', () => {
    const desktopGuide = `/en/${nonEnterpriseDefaultVersion}/desktop/contributing-and-collaborating-using-github-desktop/creating-an-issue-or-pull-request`
    const japaneseDesktopGuides = desktopGuide.replace('/en/', '/ja/')

    test('no language code redirects to english', async () => {
      const res = await get('/desktop/contributing-and-collaborating-using-github-desktop/creating-an-issue-or-pull-request')
      expect(res.statusCode).toBe(301)
      expect(res.headers.location).toBe(desktopGuide)
    })

    test('desktop/guides redirects to desktop', async () => {
      const res = await get('/en/desktop/guides/contributing-and-collaborating-using-github-desktop/creating-an-issue-or-pull-request')
      expect(res.statusCode).toBe(301)
      expect(res.headers.location).toBe(desktopGuide)
    })

    test('desktop/guides redirects to desktop (japanese)', async () => {
      const res = await get('/ja/desktop/guides/contributing-and-collaborating-using-github-desktop/creating-an-issue-or-pull-request')
      expect(res.statusCode).toBe(301)
      expect(res.headers.location).toBe(japaneseDesktopGuides)
    })
  })
})